公开(公告)号：US20180096704A1

公开(公告)日：2018-04-05

申请号：US15717035

申请日：2017-09-27

Applicant: Renesas Electronics Corporation

Inventor： Minoru KUROSAWA ,  Kichiya ITAGAKI ,  Seigi ISHIJI

IPC: G11B7/085 ,  G11B19/20 ,  G11B21/02 ,  G11B19/02 ,  G11B5/54 ,  G11B21/12 ,  G11B21/18

CPC classification number: G11B19/2063 ,  G11B5/54 ,  G11B19/04 ,  G11B19/2081 ,  G11B21/02 ,  G11B21/12

Abstract: A control device is provided which can perform a retraction operation of a head included in a disk storage device with lower power consumption.The control device of the disk storage device includes a control unit that controls a motor and retracts the head from over a disk to a ramp mechanism when power supply is shut down, an acquisition unit that acquires information related to a moving distance of the head that retracts to the ramp mechanism, and a calculation unit that calculates the moving distance of the head based on the information acquired by the acquisition unit. The control unit switches an operation of the motor from a first retract operation to a second retract operation when determining that the head reaches a first position after passing through an inclined surface of the ramp mechanism based on the moving distance calculated by the calculation unit.

公开(公告)号：US20190199265A1

公开(公告)日：2019-06-27

申请号：US16189183

申请日：2018-11-13

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Minoru KUROSAWA ,  Kichiya ITAGAKI

IPC: H02P27/08 ,  G11B19/20 ,  H02P6/182 ,  H02M7/5387

Abstract: An output control unit controls a drive terminal for a BEMF detection object phase to a high-impedance state in a mask term. A BEMF detection unit detects a voltage of the drive terminal for the detection object phase when a center tap voltage is set as a reference as BEMF in a PWM on-term for remaining two phases per PWM period in the mask term and asserts a zero-crossing signal when the voltage is reduced to zero. A PWM fixing unit fixes the remaining two phases to the PWM on-terms in a first term from a predetermined timing after an amplitude level of BEMF becomes smaller than a BEMF threshold amplitude to assertion of the zero-crossing signal. The BEMF detection unit continuously detects BEMF in the first term.

公开(公告)号：US20180083557A1

公开(公告)日：2018-03-22

申请号：US15674685

申请日：2017-08-11

Applicant: Renesas Electronics Corporation

Inventor： Minoru KUROSAWA ,  Kichiya ITAGAKI ,  Yusuke YASUMA

IPC: H02P6/10 ,  H02P6/15 ,  G11B19/20

CPC classification number: H02P6/10 ,  G11B19/2009 ,  G11B19/28 ,  H02P6/157 ,  H02P6/182

Abstract: There are provided a motor drive device and a motor system that can reduce the torque ripple of a motor. An SPM drive unit includes a plurality of high side transistors and low side transistors coupled to drive terminals of multiple phases respectively, and applies drive voltages to the drive terminals, using a PWM signal. A back electromotive force voltage phase detection unit detects each of back electromotive force voltage phases of the multiple phases. A drive voltage phase generation unit determines one of drive voltage phases in each of the multiple phases at the time of applying the drive voltages so that each of drive current phases of the multiple phases has a phase variation opposite in direction and equal to each of relative phase variations of the back electromotive force voltage phases of the multiple phases.

公开(公告)号：US20180183365A1

公开(公告)日：2018-06-28

申请号：US15816702

申请日：2017-11-17

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Minoru KUROSAWA ,  Kichiya ITAGAKI

IPC: H02P6/10 ,  H02P6/08 ,  H02P27/14 ,  H02P6/182 ,  H02P6/15

CPC classification number: H02P6/10 ,  H02P6/08 ,  H02P6/157 ,  H02P6/182 ,  H02P27/14

Abstract: A motor driving device and a motor system that can reduce a torque ripple of a motor are provided. The current control loop detects a drive current of the motor, detects an error between the detected value of the drive current and a current indication value as a target value of the drive current, and determines the duty of the PWM signal reflecting the error concerned. The back EMF phase detector detects the phase of a back electromotive force of each phase in the motor. The torque correction unit calculates a first torque correction coefficient of a periodic function based on the phase variations in the three phases of the back electromotive force, and corrects the current indication value superimposing the first torque correction coefficient on the current indication value.

公开(公告)号：US20160241177A1

公开(公告)日：2016-08-18

申请号：US14946671

申请日：2015-11-19

Applicant: Renesas Electronics Corporation

Inventor： Minoru KUROSAWA ,  Kichiya ITAGAKI ,  Seigi ISHIJI

IPC: H02P23/00 ,  H02P29/00

CPC classification number: H02P23/0077 ,  H02P6/10 ,  H02P29/00 ,  H02P29/50

Abstract: The present invention is intended to reduce noise and vibration of a motor. A first duty correction circuit generates a first corrected duty instruction value which changes with an increment same as an increment of a duty instruction value and in which an offset value as a constant is reflected. A second duty correction circuit generates a second corrected duty instruction value which changes with an increment different from an increment of the duty instruction value. A selector outputs, as the corrected duty instruction value, either one of the first corrected duty instruction value and the second corrected duty instruction value in accordance with a magnitude relation between the duty instruction value and a duty reference value.

Abstract translation: 本发明旨在减少电动机的噪声和振动。 第一占空比校正电路产生第一校正占空指令值，其以与占空指令值的增量相同的增量变化，并且其中反映作为常数的偏移值。 第二占空比校正电路产生以与占空指令值的增量不同的增量改变的第二校正占空比指令值。 A选择器根据占空指令值和占空比基准值之间的大小关系，输出第一校正占空指令值和第二校正占空指令值中的任何一个作为校正占空指令值。

公开(公告)号：US20150262599A1

公开(公告)日：2015-09-17

申请号：US14645314

申请日：2015-03-11

Applicant: Renesas Electronics Corporation

Inventor： Hideho KOYAMA ,  Minoru KUROSAWA ,  Kichiya ITAGAKI

IPC: G11B5/55 ,  H02P6/18 ,  H02P25/02

CPC classification number: G11B5/54 ,  G11B5/5534 ,  G11B5/5573 ,  G11B21/12 ,  H02P6/17 ,  H02P6/182 ,  H02P25/034

Abstract: The present invention realizes a calibration operation for detecting a motor speed, without employing digital correcting by an external CPU. The calibration operation calculates a comparison reference value corresponding to aback EMF detection signal of a back EMF detector circuit when a zero current flows through a motor and when an arm is fixed. Accordingly, the back EMF detection signal of the back EMF detector circuit is set as the first value and the second value responding to the non-zero current flowing through the motor, and the semiconductor integrated circuit calculates the comparison reference value from the first value and the second value. The difference between the comparison reference value and the comparison input value as the back EMF detection signal of the back EMF detector circuit is reduced by adjusting the gain of an internal amplifier of the back EMF detector circuit by an adjustment unit.

Abstract translation: 本发明实现了用于检测电动机速度的校准操作，而不用外部CPU进行数字校正。 当零电流流过电动机并且当臂固定时，校准操作计算对应于反电动势检测器电路的紧急EMF检测信号的比较参考值。 因此，反电动势检测电路的反电动势检测信号被设定为第一值，第二值响应流过电动机的非零电流，半导体集成电路根据第一值和 第二个值。 作为反电动势检测电路的反电动势检测信号的比较基准值和比较输入值之间的差通过调整单元调整反电动势检测器电路的内部放大器的增益来减小。